diff --git a/ledis/t_zset.go b/ledis/t_zset.go
index e0e8e2a..5d6bfb3 100644
--- a/ledis/t_zset.go
+++ b/ledis/t_zset.go
@@ -995,6 +995,9 @@ func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
 		}
 	}
 
+	if _, err := db.zIncrSize(t, destKey, num); err != nil {
+		return 0, err
+	}
 	//todo add binlog
 	if err := t.Commit(); err != nil {
 		return 0, err
diff --git a/ledis/t_zset_test.go b/ledis/t_zset_test.go
index d36572a..fc4f41f 100644
--- a/ledis/t_zset_test.go
+++ b/ledis/t_zset_test.go
@@ -314,6 +314,16 @@ func TestZUnionStore(t *testing.T) {
 	if v != 4 {
 		t.Fatal("invalid value ", v)
 	}
+
+	pairs, _ := db.ZRange(out, 0, -1)
+	n, err = db.ZCount(out, 0, 0XFFFE)
+
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if n != 3 {
+		t.Fatal("invalid value ", v)
+	}
 }
 
 func TestZInterStore(t *testing.T) {
@@ -365,4 +375,12 @@ func TestZInterStore(t *testing.T) {
 		t.Fatal("invalid value ", v)
 	}
 
+	n, err = db.ZCount(out, 0, 0XFFFF)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if n != 1 {
+		t.Fatal("invalid value ", n)
+	}
+
 }